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It's Always Sunny in Philadelphia S05E10

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It's Always Sunny in Philadelphia : D.E.N.N.I.S. System

S05, E10 ()

Dennis reveals his fool-proof system for seducing any woman to the rest of the gang, but they don't grasp the concept.

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Previous Episode

Mac and Dennis Break Up

S05, E09 (First Aired: November 12, 2009)

Mac and Dennis decide to spend some time apart; Chris lends his feline expertise to help Dee find her cat.

Next Episode

Mac and Charlie Write a Movie

S05, E11 (First Aired: December 3, 2009)

Dee gets a part in the new M. Night Shyamalan movie; Mac and Charlie see a perfect opportunity to sell their movie.